World War I

the war (1914-18) between the Allies (Great Britain, France, Russia, the U.S., Italy, Japan, etc.) and the Central Powers (Germany, Austria-Hungary, etc.)

World War I

noun

Abbr. WWI

A war fought from 1914 to 1918, in which Great Britain, France, Russia, Belgium, Italy, Japan, the United States, and other allies defeated Germany, Austria-Hungary, Turkey, and Bulgaria.

World War I

Proper noun

The war from 1914 to 1918 between the Entente Powers of the British Empire, Russian Empire, France, Italy, the United States and other allied nations, against the Central Powers represented by the German Empire, Austria-Hungary, the Ottoman Empire, and Bulgaria.